Merge branch 'tiago/cap-wnam' (#1781)

* origin/tiago/cap-wnam:
  Add changelog for #1781
  Add invalidate_wnam_over_cap_tx() unit test
  Fix wNAM edge cases in Bridge pool VP unit tests
  New Bridge pool VP unit tests for wrapped NAM
  Add `asset` field to Balance
  Refactor Bridge pool tests to allow modifying pending transfer
  Fix test_act_on_changes_storage_for_transfers_to_eth() unit test
  Test that wrapped NAM is never minted
  Fix test_redeem_native_token() unit test
  Fix test_wrapped_nam_not_burned() unit test
  Add test_wnam_doesnt_mint_nuts() unit test
  Refactor get_erc20_flow_control to use EthBridgeQueries
  Replace ERC20 supply RPC query with atomic read of all flow control data
  Flow control of NAM transferred to Ethereum
  Allow null pre-balances during Bridge pool escrow checks
  Update wNAM supplies when acting on Ethereum events
  Harden Bridge pool VP against wNAM NUT transfers
  Vet Ethereum bridge config of the native token
  Refactor redeem_native_token to use update::amount
  Use EthAssetMint helper methods
  Add helper methods to EthAssetMint

.changelog/unreleased/features/1781-cap-wnam.md

@@ -0,0 +1,2 @@
+- Control the flow of NAM over the Ethereum bridge
+  ([\#1781](https://github.com/anoma/namada/pull/1781))

ethereum_bridge/src/parameters.rs

@@ -11,7 +11,7 @@ use namada_core::ledger::storage_api::{StorageRead, StorageWrite};
 use namada_core::types::ethereum_events::EthAddress;
 use namada_core::types::ethereum_structs;
 use namada_core::types::storage::Key;
-use namada_core::types::token::DenominatedAmount;
+use namada_core::types::token::{DenominatedAmount, NATIVE_MAX_DECIMAL_PLACES};
 use serde::{Deserialize, Serialize};
 
 use crate::storage::eth_bridge_queries::{
@@ -218,6 +218,15 @@ impl EthereumBridgeConfig {
             token_cap: DenominatedAmount { amount: cap, denom },
         } in erc20_whitelist
         {
+            if addr == native_erc20
+                && denom != &NATIVE_MAX_DECIMAL_PLACES.into()
+            {
+                panic!(
+                    "Error writing Ethereum bridge config: The native token \
+                     should have {NATIVE_MAX_DECIMAL_PLACES} decimal places"
+                );
+            }
+
             let key = whitelist::Key {
                 asset: *addr,
                 suffix: whitelist::KeyType::Whitelisted,